Thanks, Michael; with that hint I tried a google search on "Asus Sabertooth FX" + "secure boot" and found a You-tube video showing me how to do all sorts of tweaking, including disabling secure boot. Tried that, and now I can boot from the rEFInd CD.

Cheers

Ian

--
Ian Park
email: i.d.c.p...@ntlworld.com
--

On 08/11/14 21:26, Michael Daffin wrote:

That is secure boot preventing you from booting an unsigned kernel. You should be able to disable it in the BIOS though some don't label it as so obviously.

On 8 Nov 2014 21:18, "Ian Park" <i.d.c.p...@ntlworld.com <mailto:i.d.c.p...@ntlworld.com>> wrote:

    I recently bought a new PC from PC Specialist (the third one I've
    had from them - the laptop I'm using to compose this, and an
    "entry level" desktop for my wife). The new machine has an Asus
    Sabretooth motherboard with a UEFI BIOS.

    The first time I booted up the PC, I was too slow to hit the F2
    key to go into the BIOS, and it booted into Windows (I'd specified
    that I wanted the machine with no OS, but I guess that PC
    Specialist installed Windows for the system test). I promptly did
    a restart, and this time caught it in time to hit F2 and go into
    the BIOS. I was able to change the boot order so that it booted
    from the Mint live DVD, stoked up gparted and re-arranged sda to
    have the partition layout I wanted (sda1 as 512MB for the EFI boot
    partition, sda2 & sda3 as 20GB partitions for root of Linux Mint
    and another OS to try out if I fancy it, sda4 as 20GB swap and
    sda5 as the remaining 160ish GB for the "visible" home partition
    to share between 2 distros. I was then able to install Mint 17 on
    sda2.

    I then followed the tutorial in Linux Voice issue 2 to set up sda1
    as the EFI boot partition and install the rEFInd boot manager. I
    hit a rock when I tried to boot from a USB stick with rEFInd on
    it, or a CD with rEFInd on it. The error message was: "The system
    found unauthorised changes on the firmware, operating system or
    UEFI drivers." I have a strong suspicion that this was an
    after-effect of the Windows installation which I deleted.

    Can anyone suggest a way of removing this Windows contamination,
    please?

    Thanks in advance

    Ian
-- Ian Park
    email: i.d.c.p...@ntlworld.com <mailto:i.d.c.p...@ntlworld.com>
    --


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